Scraper segments



Nov 3, 1964 F. BARBERO SCRAPER smumms Filed April 19. 1961 I N VEN TO RH R/v0 BHRBERO United States Patent 3,155,394 SCRAPER SEGMENTS FermoBarbero, 25 Rue dltalie, Marseille, France Filed Apr. 19, 1961, Ser. No.104,139 Claims priority, application France Apr. 21, 1960 Claims. (Cl.277141) The object of the invention is to provide a composite pistonring which not only ensures fluid-tightness but also cleans the slidingsurfaces of the cylinder and evacuates the films removed from thesurfaces.

It is characterised by the means used, considered both in conjunctionwith one another and independently of one another, and more particularlyby a ring with an oblique vertical face set back between an upper and alower shoulder, constituting a peripheral groove. On each side of thisring are disposed thin scraper elements which pro ject to a smalldistance, in such a way as to provide with the ring three scrapers forcontact on the cylinder. The oblique vertical face thus forms a centralexternal peripheral groove.

On the attached drawings, illustrating by way of an example, and withoutany limitative elfect, one possible constructional version of theinvention:

FIGS. 1 and 2 are a plan view and a side view of the ring proper;

FIG. 3 is a cross section through the same device;

FIGS. 4 and 5 illustrate the elastic scraper members;

FIG. 6 is a schematic cross section of the elements of which the ringconsists.

The ring in FIGS. 1 and 2 consists of a metal hoop on the lower andupper faces of which are vertically rigid overlapping pr-otuberances 18and 19, with recesses 18 and 19 these protuberances being set backhorizontally in order to provide the spaces 20, 21.

The vertical wall is rectilinear on the inside, as shown at 22, andoblique on the outside, as shown at 23.

The elastic scraper members 24 and 25, in FIG. 6, are situated on theshoulders, and their external edges 26 and 27 project by the samedistance as the point 23 of the oblique side, so that they are situatedin the projection of the axis XY, representing the wall of the cylinder.

A mounting 28, which functions as a spring, is polygonal in section andhas cut-out parts 29 and 30 to ensure elasticity, comes to bear againstthe internal vertical face 22, and forces it outwards to enable it tofit tightly against the cylinder.

The ring proper only has one scraper-edge 23. This edge is situatedbetween the other two elastic scraper members 26 and 27, which arespaced out and which act on the lower and upper faces.

These three sliding joints increase the hermeticity of the ring, and thegrooves 20 and 21, with their orifices 18 and 19 enable the waste matterto be removed and collected.

The elastic packing 28 adds to the thrust of the ring that of itsrecesses 29 and 30, in addition to its own bending, so that this tripleelasticity absorbs the expansionand contraction-effects and thus assistsin ensuring the complete fluid-tightness of the ring, whether cold orhot.

Finally, the scraper edges situated on different planes and mutuallyindependent, although constituting a homogeneous unit, without anydiscontinuity, ensure maximum strength combined with maximum efficiency.

The forms, dimensions and arrangements of the various elements maynevertheless vary within the limits allowed by equivalent devices, asmay also the materials used for their manufacture, without therebydeparting from the general principle of the invention described in theforegoing.

I claim:

1. A composite cylinder and piston ring assembly com prising a cylinderwall, a first central ring provided with circumerential staggered upperand lower set back shoulders for the collection of oil and a verticallyoblique face terminating in a scraper edge, a resilient member urgingsaid central ring scraper edge outward against said cylinder wall, andsecond and third elastic scraper members disposed respectively above andbelow said shoulders in scraping engagement with said cylinder wall,whereby three mutually independent scraper elements in vertical arraysuccessively engage the cylinder wall and are sepparated from each otherby two oil grooves formed as shoulder recesses set back from the obliqueface of said central ring.

2. An assembly as claimed in claim 1 in which the resilent member forurging the central ring outward comprises a split polygonal spring.

References Cited in the file of this patent UNITED STATES PATENTS

1. A COMPOSITE CYLINDER AND PISTON RING ASSEMBLY COMPRISING A CYLINDERWALL, A FIRST CENTRAL RING PROVIDED WITH CIRCUMERENTIAL STAGGERED UPPERAND LOWER SET BACK SHOULDERS FOR THE COLLECTION OF OIL AND A VERTICALLYOBLIQUE FACE TERMINATING IN A SCRAPER EDGE, A RESILIENT MEMBER URGINGSAID CENTRAL RING SCRAPER EDGE OUTWARD AGAINST SAID CYLINDER WALL, ANDSECOND AND THIRD ELASTIC SCRAPER MEMBERS DISPOSED RESPECTIVELY ABOVE ANDBELOW SAID SHOULDERS IN SCRAPING ENGAGEMENT WITH SAID CYLINDER WALL,WHEREBY THREE MUTUALLY INDEPENDENT SCRAPER ELEMENTS IN VERTICAL ARRAYSUCCESSIVELY ENGAGE THE CYLINDER WALL AND ARE SEPPARATED FROM EACH OTHERBY TWO OIL GROOVES FORMED AS SHOULDER RECESSES SET BACK FROM THE OBLIQUEFACE OF SAID CENTRAL RING.